Shandong Province City Water Supply and Drainage Water Quality Monitoring Center, Jinan, 250101, China.
School of Water Conservancy and Environment, University of Jinan, Jinan, 250022, China.
Environ Sci Pollut Res Int. 2024 Jan;31(1):422-432. doi: 10.1007/s11356-023-30908-8. Epub 2023 Nov 28.
UV/peroxymonosulfate (UV/PMS) is a promising advanced oxidation technology in water treatment. This study aimed to investigate the impact of UV/PMS on humic acid (HA) and the influence of PMS dosage, pretreatment time, pH pretreatment, nitrate, nitrite, ammonium, and bicarbonate influencing factors on disinfection byproduct (DBP) formation during post-chlorination. With increased PMS dosage or pretreatment time, the UV/PMS treatment significantly reduced ultraviolet absorbance and increased mineralization. It altered the fractional constituent as humic substances were gradually transformed into building blocks and low-molecular-weight acids. However, most DBP formation increased initially and then decreased after subsequent chlorination. Rising nitrate or nitrite concentrations markedly promoted halonitromethane (HNM) formation. The presence of ammonia had a more significant impact on dichloroacetonitrile (DCAN) formation. Bicarbonate in UV/PMS pretreatment increased carbonated disinfection byproduct (C-DBP) formation, whereas it had a negligible impact on nitrogenous disinfection byproduct (N-DBP) formation. The present study revealed the impact of a series of influencing factors on DBP formation in UV/PMS reaction systems, providing comprehensive insights on applying UV/PMS in actual practice.
UV/过一硫酸盐（UV/PMS）是水处理中一种很有前途的高级氧化技术。本研究旨在探讨 UV/PMS 对腐殖酸（HA）的影响，以及 PMS 剂量、预处理时间、pH 预处理、硝酸盐、亚硝酸盐、铵和碳酸氢盐等影响因素对后续氯化消毒副产物（DBP）形成的影响。随着 PMS 剂量或预处理时间的增加，UV/PMS 处理显著降低了紫外吸光度并增加了矿化度。它改变了分数组成，因为腐殖物质逐渐转化为结构单元和低分子量酸。然而，大多数 DBP 的形成在随后的氯化过程中先增加后减少。硝酸盐或亚硝酸盐浓度的升高显著促进了卤代硝基甲烷（HNM）的形成。氨的存在对二氯乙腈（DCAN）的形成有更显著的影响。UV/PMS 预处理中的碳酸氢盐增加了碳酸化消毒副产物（C-DBP）的形成，而对含氮消毒副产物（N-DBP）的形成影响可以忽略不计。本研究揭示了一系列影响因素对 UV/PMS 反应体系中 DBP 形成的影响，为实际应用 UV/PMS 提供了全面的见解。
